|United States Patent||7,326,269|
|Wootton , et al.||February 5, 2008|
A filtration unit for use with an environmental control unit (ECU), usually a portable ECU, which includes at least two air flow paths wherein at least one of the air flow paths allows for use of air which has not passed through a nuclear, biological, and chemical (NBC) filter and at least one other does. The filtration unit may have at least three air paths, at least two of which provide NBC filtered air. This filtration unit can provide for longer expected operational life before filter replacement is required in both contaminated and non-contaminated environments. Further, the filtration unit may include remote sensing and control apparatus allowing for quick switching between operational modes depending on the need for filtered vs. unfiltered air and for a decreased reliance on personnel for maintenance and control, and a more simplified setup.
|Inventors:||Wootton; John (St. Louis, MO), Garcia-Ortiz; Asdrubal (Chesterfield, MO)|
Engineered Support Systems, Inc.
|Filed:||February 2, 2004|
|Application Number||Filing Date||Patent Number||Issue Date|
|Current U.S. Class:||55/385.2 ; 210/130; 210/433.1; 55/309; 55/312; 55/314; 55/418; 55/420; 55/DIG.34; 95/12; 95/22; 95/273; 96/143; 96/397; 96/399|
|Current International Class:||B01D 50/00 (20060101)|
|Field of Search:||454/229,233,236,239 95/278,283,286,12,22,273 96/400,402,405,421,397,399,143 55/309,312,314,385.2,418,420,DIG.34 210/130,433|
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Technical Manual, Operator, Unit Direct Support and General Support Maintenance Manual, Field Deloyabl Environment Control Unit, Models FDECU-2, FDECU-3 and FDECU-4 (NSN 4120-01-449-0459), Army Technical Manual TM 9-4120-411-14 and Air Force Technical Manual T.O. 35E9-314-1. cited by other.